College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
Sci Total Environ. 2018 Oct 15;639:1530-1542. doi: 10.1016/j.scitotenv.2018.05.130. Epub 2018 May 29.
In this study, activated magnetic biochars (AMBCs) were successfully synthesized via one-step synthetic method with different temperature (300, 500 and 700 °C). Characterization experiments indicated that AMBCs had larger surface area, higher pore volume and more contained‑oxygen functional groups compared to the pristine biochar. In addition, AMBCs showed better adsorption performance for 17β-estradiol (E2) and copper (Cu(II)) in single/binary-solute systems than unmodified pristine biochar. AMBC-700 exhibited the highest capacity (153.2 mg/g) for E2, while the AMBC-300 showed the best adsorption capacity (85.93 mg/g) for Cu(II) in single-solute system. Adsorption of Cu(II) and E2 both followed by pseudo-second-order and Langmuir isothermal model. The initial pH of the solution had an effect on the adsorption of E2 and Cu(II) in single-solute system. Coadsorption experiments indicated that there existed site competition and enhancement of E2 and Cu(II) on the sorption in binary-solute system. Results from this study indicated that the E2 was adsorbed by hydrogen bonds, π-π EDA interactions. Cu(II) was mainly adsorbed via chemical complexation between contained‑oxygen functional groups and Cu(II) ions. Therefore, the AMBCs via one-step synthesis could be converted into value-added biochar as effective sorbent for simultaneous removal of E2 and Cu(II) from water.
在这项研究中，通过一步合成法成功地合成了活化磁性生物炭（AMBCs），其温度分别为 300、500 和 700°C。表征实验表明，与原始生物炭相比，AMBCs 具有更大的表面积、更高的孔体积和更多的含氧官能团。此外，与未改性的原始生物炭相比，AMBCs 在单一/二元溶质体系中对 17β-雌二醇（E2）和铜（Cu(II)）具有更好的吸附性能。AMBC-700 对 E2 的吸附量最高（153.2mg/g），而 AMBC-300 在单一溶质体系中对 Cu(II)的吸附量最高（85.93mg/g）。Cu(II)和 E2 的吸附均遵循准二级和 Langmuir 等温模型。溶液的初始 pH 值对单一溶质体系中 E2 和 Cu(II)的吸附有影响。共吸附实验表明，在二元溶质体系中存在着位点竞争和对 E2 和 Cu(II)吸附的增强作用。研究结果表明，E2 通过氢键、π-π EDA 相互作用被吸附。Cu(II)主要通过含氧官能团与 Cu(II)离子之间的化学络合作用被吸附。因此，通过一步合成可以将 AMBCs 转化为增值生物炭，作为同时从水中去除 E2 和 Cu(II)的有效吸附剂。
